Brake shoe



July 24, 1923.

H. JONES BRAKE SHOE Filed May e, 1929 Patented July 2li, i923.

istanti earner essi-cit. Y

.Hanny Jones, or surrnnn, new Yoan, nssrsnoa To THE .enmarcan BRAKE iSHOE FOUNDRY COlfIPANY, OF VJ'Lll/IINGTON, DELAWARE, CORPORATION 0FDELAWARE.

Bniiirn snor..

Application led May 6,

To all 107mm t may concern.'

Be it known that l, Hanni* Jones, a citi- Zen of the'Unite-d States,residing at Suffern, in the county oii Rockland and State of New York,have invented certain new and useful improvements in Brake Shoes, oiwhich the following is a specification.

It has been customary 'for some years to embed metal insert sections orblocks in the cast iron body of brake shoes to prolong the lile oit theshoe. These insert sections have been made wedge shape in some form tosecure anchorage in the body of the shoe. A s a result,the area of theinsert sections on the wearing face of the shoe is at the minimum whenthe shoe' is new and gi adnally increases as the shoe wears down inservi-ce, while the area of' the body metal on the wearing face of theshoe is at the maximum when the shoe is new and gradually decreases withthe wear of the shoe. Thus the strength of the shoe decreases as itwears because of the decrease in area oi' the anchoring body metall andthe increase in area oi the anchored insert sections.

One oi the objects of my present invention is to overcome this detect inthe manufac ture of brake shoes and to provide a shoe in which there isa comparative increase in the volume of body metal relative to thevolume of the insert sections as the shoe wears, and thereby produce ashoe in which the body increases in strength insteadci'3 decreasing instrength as the shoe wears.

lVhen the wedge shaped insert sections are embedded in the body withtheir smaller faces exposed in the wearing face oi the shoe, according`to previous'practicepeach insert section transmits the brake pressureapplied to the face of the shoe against that part or the body only whichis immediately back of the insert section. And as the insert section iswider at the haclr than at the front and the body portions between thesections are narrower at the back than at the front, a fracture usuallyoccursin the body at an inner side edge ot' an insert section.

Another object of my invention is to correct this detect in brakeshoe.construction by providing insert sections of novel shape andarranging them in the body so that they will distribute brake pressureover a greater area of the body and avoid weakening the shoe in themanner described.

have shown my invention in a selected pose oit anchoring 1920. Serial150.379,199.

torni in two kinds of shoes in the accompanydrawings and reier theretogwFig. l is a side elevatP n,y partly insection, e'l acar shoe embodyinthe'invention;

Fig. 2 a vsectional view on the line 2 2 of Fig. l;

Fig. 3 is side elevation, partly in section,

of one type of driver-slice embodying theinvention g Fin'. 1l is of Fig.3.

In the drawings, ldesignates the sections or bloclrs which are cast onorotherwise se-` cure-:l to a plurality of strips 6 of reticulated metalto 'form a complete insertupon which tl e body 7 is cast. The insertsections are preferably fiade ot ductile metal butthey may be made ofany metal or composition suitable for the purpose,`and they may be agedin any suitable manner with the a sectional view on the line i--et' strips :fio that theyL will be held in place by the strips in the body. lvprefer to usel strips made or expanded metal, as shown, but l reservethe right to use wire strips or any other lrind et strips which willserve the purthe blocks or sections in the body. y

The insert section is of novel shape in the brake shoe art,l beingtapered inwardly and having its larger tace 8 exposed in the wearingface of the shoe and its smallerV iace 9 embedded in the body.v Thesides l0 of they section incline fromy the outer face 8 inwardly andmerge into the edgesof the rounded inner face 9 so that in cross-sectionthe block or insert is substantially domeshaped in appearance. y v l Theadvantages of myinvention will be readily appreciated by those skilledin the art. The maximum area of the insert sections is exposed in thewearing` face of the shoe and is brought into contact with the, wheelwhen the shoe is new, and at this time the body is of maximum strength.My inthe sides ofthe sections. bution ofbralre pressure around the twosides andfbaclrl or the sections and the tapering shape of the sectionsand the absence of sharp edges on the embedded 'face and sides of thesections avoids the tendency or' the body to 'fracture which is incidentto the use of wedge shaped blocks or sections tapering outwardly. listhe shoe decreases .in cross section by wear the body increases involuine as compared with the insert sections and this means acomparative increase Vof strength for the shoe7 the importance ofwhich'is apparent.

l hare iound'in practice that a brake shoe embodying` my invention hasgreater strength throughout its lii'e and is less likely to Jiracturethan 'shoes made with Awedge shaped blocks or ysections taperhereindescribed, and l reservo the right to make any changes in theconstruction and arrangement of parts, and the inaterials of This widedistril which the parts are made, as all'within the and spaced apartlongitudinally of they body, and each oiE said inserts beingsubstantially dome-shaped in cross section and having a rounded innerface merging` into sides which diverge to the outer tacel 2. brake shoecompri Y plurality of elongated insert blocks or sections embeddedtransversely in the body and spaced apart longitudinally of the body,said inserts being` substantially dome-shaped in cross section, andmeans embedded in said inserts and said body for .holdingv the blocks orsections in the body. Y

3. brake shoe comprising a body having a plurality of elongated insertblocks or sec. tions embedded transversely 1n thebody and n spacedapartlongitudinally oit the body, said inserts beingsubstantiallydeine-shaped in cross section, and a plurality of reticulated metalstrips embedded in said blocks or sections and in said body on edge tothe wearing lace of the shoe forholding the blocks or` sections in thebodyf HARRY JONES;

tted to extend transverselybt' the lbody sing a body having;Y

